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    <title>Document</title>
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    <script>
      /*   var a1 = prompt('请输入一个数字');
      var a2 = prompt('请再输入一个数字');
      var a3 = parseFloat(a1) + parseFloat(a2);
      console.log(alert('结果是' + a3)); */
      var a = 10;
      var d = 20;
      var b = a++ + a++ + ++a;
      var c = d-- + --d;
      console.log(c);
      var f = '刘德华';
      var e = 10;
      console.log((刘德华 = '刘德华'));
      console.log('10' == e);

      var n1 = 10;
      var n2 = 100;
      var s1 = n1 > n2;
      console.log(s1);
      var s2 = n1 ==11;
      console.log(s2);
      var s3 = n1 != n2;
      console.log(s3);

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